package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.AttrResponseVo;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.BrandVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilder;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.*;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.swing.*;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @Author:Panghl
 * @Description:
 * @Date: Created in 14:21 2022/7/2
 * @Modified By:
 */
@Slf4j
@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient restHighLevelClient;
    @Autowired
    private ProductFeignService productFeignService;

    /**
     * @param param 检索的参数
     * @return
     */
    @Override
    public SearchResult search(SearchParam param) {
        SearchResult searchResult = null;
        //1.动态构建出查询需要的DSL语句
        SearchRequest searchRequest = buildSearchRequest(param);

        try {
            //2、执行检索请求
            SearchResponse response = restHighLevelClient.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);

            //3、分析响应数据封装成我们需要的格式
            searchResult = buildSearchResult(response, param);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return searchResult;
    }

    /**
     * 构建结果数据
     *
     * @param response
     * @param param
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
        SearchResult searchResult = new SearchResult();
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>();
        // 1. 返回所有查询到的商品
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel sku = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String skuTitleStr = skuTitle.getFragments()[0].string();
                    sku.setSkuTitle(skuTitleStr);
                }
                esModels.add(sku);
            }
        }
        searchResult.setProducts(esModels);
        // 2. 当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();

        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();

            // 属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            attrVo.setAttrId(attrId);
            // 属性的名字
            ParsedStringTerms attr_name_agg = bucket.getAggregations().get("attr_name_agg");
            String attrName = attr_name_agg.getBuckets().get(0).getKeyAsString();
            attrVo.setAttrName(attrName);


            // 属性的值
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream()
                    .map(item -> {
                        String keyAsString = ((Terms.Bucket) item).getKeyAsString();
                        return keyAsString;
                    }).collect(Collectors.toList());
            attrVo.setAttrValue(attrValues);

            attrVos.add(attrVo);
        }
        searchResult.setAttrs(attrVos);

        //3.当前所有商品涉及到的所有品牌信息
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        List<? extends Terms.Bucket> brand_aggBuckets = brand_agg.getBuckets();
        for (Terms.Bucket brand_aggBucket : brand_aggBuckets) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            Long brandId = brand_aggBucket.getKeyAsNumber().longValue();
            brandVo.setBrandId(brandId);


            // 得到品牌名称
            ParsedStringTerms brand_name_agg = brand_aggBucket.getAggregations().get("brand_name_agg");
            String brand_name = brand_name_agg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brand_name);
            // 得到品牌图片
            ParsedStringTerms brand_img_agg = brand_aggBucket.getAggregations().get("brand_img_agg");
            String brand_img = brand_img_agg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brand_img);

            brandVos.add(brandVo);
        }
        searchResult.setBrands(brandVos);

        //4.当前所有商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            // 得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCtalogId(Long.parseLong(keyAsString));

            // 得到分类名
            ParsedStringTerms caralog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = caralog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCtalogName(catalog_name);

            catalogVos.add(catalogVo);
        }
        searchResult.setCatalogs(catalogVos);

//        ========== 以上从聚合信息中获取===========
        //5.分页信息-页码
        searchResult.setPageNum(param.getPageNum());
        long total = hits.getTotalHits().value;
        searchResult.setTotal(total);
        int totalPages = total % EsConstant.PRODUCT_PAGESIZE == 0 ? (int) total / EsConstant.PRODUCT_PAGESIZE : ((int) total / EsConstant.PRODUCT_PAGESIZE + 1);
        searchResult.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 0; i < totalPages; i++) {
            pageNavs.add(i + 1);
        }
        searchResult.setPageNavs(pageNavs);


        // 6构建面包屑导航
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            List<SearchResult.NavVo> navVos = param.getAttrs().stream().map(attr -> {
                // 1. 分析每一个查询参数的值
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                // attrs=2_2寸:6寸
                String[] s = attr.split("_");
                
                searchResult.getAttrIds().add(Long.parseLong(s[0]));

                navVo.setNavValue(s[1]);
                R info = productFeignService.info(Long.parseLong(s[0]));
                if (info.getCode() == 0) {
                    AttrResponseVo attrInfo = info.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    navVo.setNavName(attrInfo.getAttrName());
                } else {
                    navVo.setNavName(s[0]);
                }

                // 2. 取消了这个面包屑以后，我们跳转到哪个地方，将请求地址的url里面的当前置空
                // 拿到所有的查询条件，去掉当前的
                String replace = replaceQueryString(param,attr,"attrs");
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
                return navVo;
            }).collect(Collectors.toList());
            searchResult.setNavs(navVos);
        }


        // 品牌，分类
        if (param.getBrandId()!=null && param.getBrandId().size()>0){
            List<SearchResult.NavVo> navs = searchResult.getNavs();


            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            // 远程查询所有品牌
            R infos = productFeignService.infos(param.getBrandId());
            if (infos.getCode() == 0){
                List<BrandVo> brand = infos.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getName());
                    replace = replaceQueryString(param,brandVo.getBrandId(),"brandId");
                }
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
                navVo.setNavValue(buffer.toString());
            }
            navs.add(navVo);
        }

        //todo : 分类：不需要导航取消


        return searchResult;
    }

    public String replaceQueryString(SearchParam param,String value,String key){
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode = encode.replace("+","%20"); // 浏览器对空格编码和java的差异化处理
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return param.get_queryString().replace("&"+key+"=" + encode, "");
    }

    /**
     * 准备检索请求
     * # 模糊匹配，过滤(按照属性，分类，品牌，价格区间，库存)，排序，分页，高亮 ，聚合分析
     *
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder(); //构建DSL语句的

        /**
         * 模糊匹配，过滤(按照属性，分类，品牌，价格区间，库存)
         */
        // 1、构建bool query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        // 1.1、 must 模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }

        // 1.2、bool -- filter-- 按照三级分类查询
        if (null != param.getCatalog3Id()) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }
        // 1.2、 bool - filter-- 按照品牌查询
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
        }
        // 1.2、 bool - filter-- 按照所有属性查询
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            // attrs=1_5寸：8寸& attrs=2_16G:8G
            for (String attr : param.getAttrs()) {
                String[] s = attr.split("_");
                // 属性id
                String attrId = s[0];

                // 属性的值
                String[] attrValues = s[1].split(":");
                BoolQueryBuilder boolQueryNested = QueryBuilders.boolQuery();
                boolQueryNested.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                boolQueryNested.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
                // 每一个必须都得生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", boolQueryNested, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }
        // 1.2、 bool - filter-- 按照是否存在库存查询
        if (param.getHasStock() != null) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock().equals(1)));
        }

        // 1.2、 bool - filter-- 按照价格区间查询
        String skuPrice = param.getSkuPrice();
        if (!StringUtils.isEmpty(skuPrice)) {
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] priceBetween = skuPrice.split("_");
            if (priceBetween.length == 2) {
                // 区间
                rangeQuery.gte(priceBetween[0]).lte(priceBetween[1]);
            } else if (priceBetween.length == 1) {
                if (param.getSkuPrice().startsWith("_")) {
                    rangeQuery.gte(priceBetween[0]);
                } else if (param.getSkuPrice().endsWith("_")) {
                    rangeQuery.lte(priceBetween[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }

        // 把以前的所有条件都拿来进行封装
        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮
         */
        // 2.1 排序
        if (!StringUtils.isEmpty(param.getSort())) {
            String sort = param.getSort();
            // sort=hotCount_asc/desc
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }
        // 2.2 分页
        sourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);
        // 2.3 高亮
        if (!StringUtils.isEmpty(param.getKeyword())) {
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red'> ");
            highlightBuilder.postTags(" </b>");
            sourceBuilder.highlighter(highlightBuilder);
        }

        /**
         * 聚合分析
         */
        // 品牌聚合
        AggregationBuilder brandAgg = AggregationBuilders.terms("brand_agg").field("brandId").size(10);
        brandAgg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(10));
        brandAgg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(10));
        sourceBuilder.aggregation(brandAgg);
        // 类型聚合
        AggregationBuilder catalogAgg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(10);
        catalogAgg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(10));
        sourceBuilder.aggregation(catalogAgg);
        // 属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        // 聚合出当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId").size(10);
        // 还有个分析出当前attr_id对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(10));
        // 聚合分析出当前attr_id对应的所有可能的属性值attrValue
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(10));
        attr_agg.subAggregation(attr_id_agg);
        // 3.聚合Attr
        sourceBuilder.aggregation(attr_agg);


        log.info("构建的DSL: {}", JSONObject.toJSONString(sourceBuilder.toString()));
        return new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
    }
}
